Hi people,
After my fights with migrating SP1 back to Classic and integrating Arkos with Z88DK, I have written down some notes that may help other contributors (or myself!) in future integrations. They can be found here: https://github.com/z88dk/z88dk/wiki/Adding-new-software , and any feedback/fixes are welcome.
Thanks so much Dom for your support, I couldn't have done it without you.